Electrical apparatus.



PATENTED MAY 26, 1908.

R. P. JACKSON. ELECTRICAL APPARATUS.

APPLICATION FILED SEPT. 3. 1907.

INVENTOR 8 m. W.. J

/ ATTCRNEY shield ofmy invention, which is given the. '50 v UNITEDsTArEs PATENT OFFICE.

RAY P. JACKSON, orwiLKINsBuRc, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSEELEC-' TRIO &

MANUFACTURING COMPANY, A CORPORATIONOF PENNSYLYANI-A.'

ELECTRICAL APPARATUS.

To all whom it may concern:

Be it known that I, RAY P. JACKSON, a

citizen of the United States, and a resident of and useful Improvementin Electrical Apparatus, ofwhich the followingis aspecification.

My invention relates to electric insulators and has special reference toinsulating sleeves and bushings which are adapted for use in very highvoltage electric apparatus, such I ,The general form of theishield isthat of a i as alternating current transformers. g

The ob ect of my mventlon is to provide means for effecting asubstantially uniform.

distribution of potential over the surface of an insulating sleeve orbushing that is sup;

ported by a plate or frame of conducting material intermediate its ends.A High voltage electrical apparatus, of which transformers, lightningarresters and condensers are examples, are frequently located influid-containing tanks of conducting material, such as boiler iron orsteel.

.The conducting leads for apparatus so" 10- cated are brought outthrough sleeves or bushings of glass, porcelain or other insulatingmaterial, which are usually, supported by the cover or a wall of thefluid-containing tank.

When the difference of potentialbetween the conducting lead and thesuporting wall of'the tank is very great, it is c esirable that thedistribution of )otential over the-surface of the bushing shali besubstantially uniform in order to avoid the destruction of theinsulator, but, under usual conditions, such distribution does notexist. According to my present invention, I provide a shield ofconducting material which is connected to the supporting plate, at itsjunction with the bushing, and which flares outwardly from the plate andfrom the bushing. Bythis means, I am able to-eifect a substantiallyequal distribution of potential over the surface of the bushing.

The single figure of the accompanying drawing is a sectional elevation.of an lnsulating. sleeve or bushing provided with the form of a skirtor hell. The form of the shield 'mayfl of course, be variedwithout dearting from the spirit of my invention and- Specification of LettersPatent.

I sulator. I I I i 4. The combination with an electric line or by theuse ofa'glura-lity ofcondueting strips about the bushing and co'nequallydis ose .nected to tie conducting platen g Referring to the drawing, aninsulating:

-(so der 2, is mounted in a suitable opening 3 in a sleeve or bushing 1,having afiange or shoulplate 4 of conducting rr-iaterial. Acurrentconductin lead 5 passes'through the bushing and a shie d 6 ofconducting. material is con-" nectedwith the late at'its junction withthe bushing and; ares outwardly therefrom.

bell o'r skirt, but stricted in this regard.

Icl'aim as my mventionp Patented May 2 1 908. Application filedSeptember 3, 1907. Serial No. 391,249 I my invention isgnot re- 1,. Thecombination with an electric conductor, an insulating sleeve thereforand a support intermediatethe ends of the sleeve,

of a shield of conducting-material for effecting substantially uniformdistribution of the potential of the-insulator betweenathe sup- .portand. the conductor. a

2. The combination with an electric conductor, an insulating sleevetherefor and. a

support intermediate the ends of the sleeve, of a bell-shaped shield ofconducting mate-- rial connected to the support for effectingsubstantially uniform distribution of the potential between the supportand the con' ductor.

3. The combination with an electricfconductor, an insulating sleevetherefor and a.

support intermediate the ends of the sleeve, of ,aiiaring shield ofconducting material'that surrounds the insulator and is secured to thesupport and extends outwardly from the-in lead conductor, an insulatingsleeveor bushing therefor, and a supporting plate of conducting materialfor thesleeve orbushing, of abell or skirt of conducting materialsecured to the supporting plate-at its junction with the insulator f andflaring outwardly from the insulator and the plate for effecting asubstantially'uniforin distribution of potential* on the surface of theinsulator be-- plate and .the line or lead conor bushing is fitted, of ahell or skirt of con- 1 In testimony whereof, I have hereunto ductingmaterial secured to the supporting subscribed my name this 29th dayof'August, 10 plate at its junction with the insulator and v1907.flaring outwardly from the insulator and the 5 plate for effecting aneven distribution of potential on the surface of the insulator be-Witnesses: tween the plate and the line or lead con- 4 R. B. INGRAM,ductor. BIRNEY HINES.

RAY l LLQ'ILSON.

i may

